2LUS

NMR structure of Carcinoscorpius rotundicauda thioredoxin related protein 16 and its role in regulating transcription factor NF-kB activity


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

NMR structure of Carcinoscorpius rotundicauda thioredoxin-related protein 16 and its role in regulating transcription factor NF-kB activity.

Giri, P.K.Jing-Song, F.Shanmugam, M.K.Ding, J.L.Sethi, G.Swaminathan, K.Sivaraman, J.

(2012) J.Biol.Chem. 287: 29417-29428

  • DOI: 10.1074/jbc.M112.379859

  • PubMed Abstract: 
  • Thioredoxins (Trxs), which play a key role in maintaining a redox environment in the cell, are found in almost all organisms. Trxs act as potential reducing agents of disulfide bonds and contain two vicinal cysteines in a CXXC motif at the active sit ...

    Thioredoxins (Trxs), which play a key role in maintaining a redox environment in the cell, are found in almost all organisms. Trxs act as potential reducing agents of disulfide bonds and contain two vicinal cysteines in a CXXC motif at the active site. Trx is also known to activate the DNA binding activity of NF-κB, an important transcription factor. Previously, Trx-related protein 16 from Carcinoscorpius rotundicauda (Cr-TRP16), a 16-kDa Trx-like protein that contains a WCPPC motif, was reported. Here we present the NMR structure of the reduced form of Cr-TRP16, along with its regulation of NF-κB activity. Unlike other 16-kDa Trx-like proteins, Cr-TRP16 contains an additional Cys residue (Cys-15, at the N terminus), through which it forms a homodimer. Moreover, we have explored the molecular basis of Cr-TRP16-mediated activation of NF-κB and showed that Cr-TRP16 exists as a dimer under physiological conditions, and only the dimeric form binds to NF-κB and enhances its DNA binding activity by directly reducing the cysteines in the DNA-binding motif of NF-κB. The C15S mutant of Cr-TRP16 was unable to dimerize and hence does not bind to NF-κB. Based on our finding and combined with the literature, we propose a model of how Cr-TRP16 is likely to bind to NF-κB. These findings elucidate the molecular mechanism by which NF-κB activation is regulated through Cr-TRP16.


    Organizational Affiliation

    Department of Biological Sciences, National University of Singapore, Singapore 117543.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioredoxion
A
143Carcinoscorpius rotundicaudaN/A
Find proteins for A3E0V9 (Carcinoscorpius rotundicauda)
Go to UniProtKB:  A3E0V9
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LUS Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-07-11
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references